Method and system for reducing transients in DC-DC converters
AssigneeIntersil Americas Inc.
InventorsSteven Laur, Daniel Zheng
Life of this patent
Estimating the term…
Abstract
One embodiment pertains to a method including determining the duty cycle of a PWM signal, operating in valley current control mode when the duty cycle is greater than fifty percent, operating in peak current control mode when the duty cycle is less than fifty percent, and including, commencing a PWM pulse upon the occurrence of a pulse of a first clock signal pulse, and terminating the PWM pulse upon a level of a signal exceeding a positive window threshold.
Claims17
A voltage converter, comprising:
- a window comparator;
- an inductor current sense signal coupled to a first input of the window comparator;
- a window generator including a positive window voltage node coupled to a second input of the window comparator, and a negative window voltage node coupled to a third input of the window comparator;
- one or more switches having a plurality of terminals, including at least one terminal coupled to an output of the window comparator;
- a PWM signal generator coupled to at least one of the terminals of the one or more switches;
- and
- mode switch-over logic coupled to the terminals of the one or more switches, and including an input coupled to an output of the PWM signal generator.
A method of operation of a current mode voltage converter, comprising:
- determining a duty cycle of a PWM signal;
- obtaining a positive window threshold and a negative window threshold;
- operating in a valley current control mode when the duty cycle is greater than fifty percent;
- and
- operating in a peak current control mode when the duty cycle is less than fifty percent, including:
- commencing a PWM pulse upon an occurrence of a pulse of a first clock signal pulse;
- and
- terminating the PWM pulse upon a level of a signal exceeding the positive window threshold.
A method of operating a current mode voltage converter, comprising:
- determining a duty cycle of a PWM signal;
- obtaining a positive window threshold and a negative window threshold;
- operating in a peak current control mode when the duty cycle is less than fifty percent;
- operating in a valley current control mode when the duty cycle is greater than fifty percent, including:
- commencing a PWM pulse upon a level of a signal being less than the negative window threshold;
- and
- terminating the PWM pulse upon the occurrence of a pulse of a second clock signal.
Dependencies are inferred from the claim text.